Install photovoltaic system with air-to-water heat pump?

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Well, then name a mistake?

So far, you're only making a false claim, because Andreas also only reaches the COP of the air heat pump with the split air conditioning units. And he clearly states when he switches back to his old oil heating system. He also explains to Prof. Quaschning that large systems only pay off as DIY. Here, however, there is already a hint about correspondingly large battery storage.

This is also confirmed by an engineer colleague of mine, look up "Energiesparkommissar," who calculates everything with source references just like Andreas on the topic of photovoltaics. This is about concrete calculation values and benefits, not emotions.

Watching countless videos is one thing, understanding what is being said is something else :)

Sure, getting annoyed about low returns, but then buying batteries. :D

@ That is also confirmed by an engineer colleague of mine, check out "Energiesparkommissar", he calculates everything with just as many source references as Andreas on the topic of photovoltaics.

Neither he nor Schmitz will manage to calculate a small system with storage better than a large one without it. That both the system and storage are profitable for Schmitz is clear in the case of self-construction. But very few do that. If a calculation ever shows that a small system might make sense, then the current electricity consumption (with fossil heating and mobility) was extrapolated incorrectly to the future. Within the lifetime of the system, everyone will have a heat pump and an electric car. Both are factors, by the way, that make storage less profitable. As for Quaschning: he also says that storage does not pay off and he has his roof full. But he has nothing against storage because he knows that the "good feeling of higher self-consumption" leads to more photovoltaics being installed. Besides, we will need storage in 10 years, so it doesn’t hurt if the industry can scale up properly. So, I’m going to sign off now, unless there are still specific questions from the TE here. I have said everything, it should, if anything, encourage independent research. Sources can be requested from me via PM if interested. After all, no one has to believe me. ;)

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well, then name a mistake?

sorry, can you please just stop. You quote incorrectly, don’t read properly and then you’re also talking nonsense. I wrote "I have watched countless videos by Schmitz and never saw any 'mistakes'." So you want me to show you mistakes that I never saw?
I'm out of here, also there are better forums for photovoltaic questions :p

I only brought up DIY systems because of your thesis that a large system would always be better. This is not about DIY, I agree with you on that.

Your other thesis is just as unprofitable, namely the small system with storage compared to a large system without storage, if you cannot use the electricity yourself and are forced to sell it for a few cents or even get nothing for it.

However, this is not about photovoltaics with storage but only about the size of the photovoltaic system. And here a small 30m² photovoltaic system is generally profitable. A larger one only if building-external services can be used, for example if you can charge an electric car when it stands at home for days, because that also requires more area than a normal house construction usually provides. (The efficiency of photovoltaics is too poor for that.) Or possibly if you can sell the electricity to tenants, provided there are such.

It is clear that politics wants many people to make investments and ideally with storage for a decentralized energy supply. But then an investor should also be able to expect an appropriate return through electricity sales, which the current feed-in tariff does not represent.

However, new funding programs are supposed to be introduced at Easter, and it remains to be seen whether photovoltaics and storage will at least be explicitly included in the funding for house construction.

Furthermore, even as a professor, one should not forget in an industrialized country that it is not about consuming three times more energy than a current average household, but about saving energy. Of course, he can afford it and act this way for purely ecological reasons. But for many, especially currently, economic profitability is important.

Also, one must not forget that all of this is forecasted because no one can currently estimate price developments, including for electricity.